A schoolboy sexually abused two brothers after Birmingham social services failed to alert another local authority about his predatory behaviour.

The 16-year-old had faced previous sex abuse claims while living in Hall Green. It is understood he was also accused of harming a fellow pupil with Silica gel.

But it is claimed Birmingham social services failed to take the allegations seriously or pass on the 2009 incidents to social workers in Sheffield when his family moved to that city.

With no social worker supervision, he went on to sexually abuse two young brothers and physically assaulted their five-year-old sibling and was only caught when his terrified victims told their mum.

The sadistic schoolboy, whom we cannot name for legal reasons, has now been sentenced to a two-year youth rehabilitation order after being convicted of five sex offences.

His victim’s devastated mother spoke about her children’s ordeal and attacked Birmingham social services for not alerting colleagues in Sheffield about the previous incidents.

The mum, who is suffering from a terminal illness, said: “He was reported for inappropriate sexual behaviour in Birmingham. Instead of dealing with this issue, his family moved to Sheffield and kept this information hidden from close friends.

“Even more relevant is that Birmingham social services failed to chase the matter, despite them knowing about his history.”

It was in September last year that the mum of three boys discovered the full sinister truth about the schoolboy, who was then aged 15 and the son of a family friend.

She recalled: “His mother used to visit me quite often and bought him with her to my house.

“This particular night he had attacked my five-year-old son for no reason whatsoever. He kicked him in the head, then punched him in his mouth.

“I was in another room but heard the screams and found my young son bleeding profusely. I kicked him out of the house where he then smashed my car window.

“My older son came outside and challenged him for attacking his brother, at which point he picked up a massive sandstone block, thrust it on to his shoulders and charged towards my son shouting, ‘I’m going to kill you’.

“I managed to push my children inside the front door and as I closed it, the block smashed through the glass and missed me by centimetres.

“The police were called out and he was later cautioned for the assault on the youngest child under restorative justice.”

But it was when the police left that the mum learned the full horror of what had been going on - he had been abusing both of her older boys for a number of months.

She said: “He had threatened to kill them if they told anyone, but the events of the night had scared them so much they had to tell me.

“The boys were interviewed by the police who knew straight away that they were dealing with a violent, predatory sex offender.”

The schoolboy, the son of a leading charity figure, was later charged with five counts of serious sexual assault and indecent sexual acts. He was found guilty of all offences at Sheffield Magistrates Court on August 18 and then sentenced on September 28.

Incredibly, despite the seriousness of the offences, he was NOT placed on the Sex Offender register.

The mum said: “In all this time, my family has not received an apology from his family, nor did he admit his guilt or show remorse.

“This was exemplified at the sentencing hearing when he approached me, stuck his middle finger up and laughed. His father also laughed as I was led away by the police.

“I was visibly upset at what he had done, and have been greatly affected by his actions.

“I felt he was mocking me because he was only given a two year youth rehabilitation order and he is free to wander about unsupervised.”

The mum said the schoolboy had bragged to her sons about other children he had abused, information which had been passed on to police.

She added: “He and his family have abused their position in the community to besmirch my credibility and question my integrity and reliability.

“I believe he may have abused other children and would urge any with information to contact police without delay.”

It is understood Birmingham social services were alerted to the previous sex abuse allegations in 2009 but simply referred them to CAMS (Child and Adolescent Mental Health Services).